<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>8.学生管理系统</title>
  </head>

  <body>
    <div id="app">
      <div>
        <span>姓名:</span>
        <input v-model="userName" type="text" />
      </div>
      <div>
        <span>年龄:</span>
        <input v-model="age" type="number" />
      </div>
      <div>
        <span>性别:</span>
        <select v-model="gender">
          <option value="男">男</option>
          <option value="女">女</option>
        </select>
      </div>
      <div>
        <button @click="change">添加/修改</button>
      </div>
      <div>
        <table border="1" cellpadding="10" cellspacing="0">
          <tr>
            <th>序号</th>
            <th>姓名</th>
            <th>年龄</th>
            <th>性别</th>
            <th>操作</th>
          </tr>
          <tr v-for="(item,index) in list" :key="item.id">
            <td>{{index+1}}</td>
            <td>{{item.userName}}</td>
            <td>{{item.age}}</td>
            <td>{{item.gender}}</td>
            <td>
              <button @click="del(item.id)">删除</button>
              <button @click="edit(item)">编辑</button>
            </td>
          </tr>
        </table>
      </div>
    </div>
    <script src="../vue.js"></script>
    <script>
      const app = new Vue({
        el: "#app",
        data: {
          userName: "",
          age: "",
          gender: "",
          list: [
            { id: 1, userName: "Tom", age: "18", gender: "男" },
            { id: 2, userName: "lily", age: "20", gender: "女" },
            { id: 3, userName: "Ana", age: "19", gender: "女" },
          ],
          isEdit: false,
          currentId:null
        },
        methods: {
          change() {
            if (!this.userName || !this.age || !this.gender) {
              alert("输入不能为空");
              return;
            }
            if (this.isEdit) {
              const index = this.list.findIndex(item=>item.id === this.currentId)
              if(index !==-1){
                this.list[index] = {
                  id:this.currentId,
                  userName:this.userName,
                  age:this.age,
                  gender:this.gender
                }
                this.currentId = null // 重置编辑项
                this.isEdit = false // 重置编辑状态
              }
            } else {
              this.list.push({
                id: this.list.length + 1,
                userName: this.userName,
                age: this.age,
                gender: this.gender,
              });
            }
            this.userName = "";
            this.age = "";
            this.gender = "";
          },
          del(id) {
            this.list = this.list.filter((item) => item.id !== id);
          },
          edit(item) {
            this.isEdit = true;
            this.currentId = item.id
            this.userName = item.userName;
            this.age = item.age;
            this.gender = item.gender;
          },
        },
      });
    </script>
  </body>
</html>
